Experimental study of gas and liquid permeability of a mortar

Loosveldt, Hélène; Lafhaj, Zoubeir; Skoczylas, Frédéric

doi:10.1016/s0008-8846(02)00793-7

Cited by 182 publications

(81 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Measurement of gas permeability is easier, but requires prior drying of the sample to a well-defined state of saturation, which may take more than one year. Hence, indirect experimental methods such as beam-bending [4] have also been similar discrepancy is widely observed for other cement-based materials [5,6]. Moreover, for the same fluid -water -the permeability measurements span 2 -3 orders of magnitude.…”

Section: Introductionsupporting

confidence: 52%

“…where ρ is the fluid density, and g is the acceleration due to gravity. For water at 20° C, Several hypotheses have been advanced to try and explain the broad range of measured permeability values in cement-based materials including: gas slippage on the surface of the pores [5]; microcracks induced by sample drying prior to gas permeability measurements [13]; delayed cement hydration [6,14]; swelling of cement hydrates in contact with water [14] and dissolution and migration of fine elements [6,9,14,15]. However, careful examination shows that none of these is sufficient to explain fully the wide variation of results.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A 3D lattice Boltzmann effective media study: understanding the role of C-S-H and water saturation on the permeability of cement paste

Zalzale

McDonald

Scrivener

2013

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

A 3D lattice Boltzmann model is developed and used to calculate the water and gas permeabilities of model cement pastes at different degrees of water saturation. In addition to permeable micron-sized capillary pores and impermeable solid inclusions, the lattice Boltzmann model comprises weakly-permeable nano-porous calcium silicate hydrate (C-S-H).The multi-scale problem is addressed by using an effective media approach based on the idea of partial bounce-back. The model cement paste microstructures are generated with the platform µic. The critical parameters, C-S-H density and capillary porosity, are taken from 1 H nuclear magnetic resonance relaxation analysis. The distribution of water and air is defined according to the Kelvin-Laplace law. It is found that when the capillary porosity is completely saturated with a fluid (either water or gas), the calculated intrinsic permeability is in good agreement with measurements of gas permeability on dried samples (10 -17 -10 -16 m 2 ).However, as the water saturation is reduced, the calculated apparent water permeability decreases and spans the full range of experimentally measured values (10 -16 -10 -22 m 2 ). It is concluded that the degree of capillary water saturation is the major cause for variation in experimental permeability measurements. It is further concluded that the role of the weaklypermeable C-S-H, omitted in earlier modelling studies, is critical for determining the permeability at low capillary saturation. Keywords

show abstract

Section: Introductionsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

A 3D lattice Boltzmann effective media study: understanding the role of C-S-H and water saturation on the permeability of cement paste

Zalzale

McDonald

Scrivener

2013

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…As the gas and ethanol permeabilities of mortar have been shown to be of the same order (F. Skoczylas et al [8]), here they were also measured in order to identify the influence of rehydration on permeability. …”

Section: Relationship Between Rehydration and Hydrostatic Permeabilitymentioning

confidence: 99%

Characterization of a rehydration phenomenon on cement-based materials containing heat-induced cracks: coupled transport properties and X-ray micro-tomography

Pei¹,

Skoczylas²,

Hauss³

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

Self Cite

View full text Add to dashboard Cite

This study deals with the phenomenon of rehydration in heat-induced macro/micro cracks for a normalized mortar and concrete paste, both having a W/C ratio of 50%. Reyhydration was tested using steady state gas (argon) and ethanol permeability measurements provided by our laboratory, combined with thermo-gravimetric (ATG) and micro-tomographic (CT) analyses. Prior to these experiments, all of the samples were subjected to successive heating-cooling cycles, from a 105°C reference state, up to 600°C. At the macroscopic level, the material's transport properties are determined by means of gas permeability tests, following which the same sample is measured using the ethanol permeability test (after saturation in distilled water and drying at 105°C). At the microscopic level, the pore network of the heat-treated cement pastes is characterized using CT (voxel≈4μm), before and after rehydration in order to assess its 3D profile. This includes quantitative analysis of the crack size, the connected and non-connected pore volume, the pore surface area, as well as the pores' distribution. The self-healing capacity of saturated heat-treated cement-based materials is clearly revealed, when these results are combined with ATG analyses of the material's mineralogical composition.The results show that following heat-treatment, the gas permeability of mortars is of the order of 10 -15 m 2 at 600°C, whereas following rehydration, their ethanol permeability lies in the range between 10 -18 and 10 -17 m 2 , which is quite close to the intact gas permeability of mortar at 105°C.

show abstract

“…where k is the filter cake permeability [m medium when the flow is laminar [6]. The permeability of a liquid such as water, through a porous sample can be measured simply by allowing it to flow continuously through the sample with a constant pressure gradient [6].…”

Section: Introductionmentioning

confidence: 99%

“…The permeability of a liquid such as water, through a porous sample can be measured simply by allowing it to flow continuously through the sample with a constant pressure gradient [6]. The volume of liquid that flows through the sample is measured at specific time intervals, which can be used to calculate the volumetric flow rate [7,8].…”

Section: Introductionmentioning

confidence: 99%

Using statistical and artificial neural networks to predict the permeability of loosely packed granular materials

Mahdi

Holdich

2016

Separation Science and Technology

View full text Add to dashboard Cite

Well-known analytical equations for predicting permeability are generally reported to overestimate this important property of porous media. In this work, more robust models developed from statistical (MVR) and Artificial Neural Network (ANN) methods utilized additional particle characteristics ('fines ratio' (x 50 /x 10 ) and particle shape) that are not found in traditional analytical equations. Using data from experiments and literature, model performance analyses with average absolute error (AAE) showed error of ~40% for the analytical models (Kozeny-Carman and HappelBrenner). This error reduces to 9% with ANN model. This work establishes superiority of the new models, using experiments and mathematical techniques.

show abstract

Experimental study of gas and liquid permeability of a mortar

Cited by 182 publications

References 9 publications

A 3D lattice Boltzmann effective media study: understanding the role of C-S-H and water saturation on the permeability of cement paste

A 3D lattice Boltzmann effective media study: understanding the role of C-S-H and water saturation on the permeability of cement paste

Characterization of a rehydration phenomenon on cement-based materials containing heat-induced cracks: coupled transport properties and X-ray micro-tomography

Using statistical and artificial neural networks to predict the permeability of loosely packed granular materials

Contact Info

Product

Resources

About